Are you in Lahore? The dealer I booked from had both in showroom, go look at both side by side.
Definitely stretch your budget to GLX, biwi se udhaar le lo beshak (Pro tip, don't 
) , ya kissi dost ya rishtedaar se.
The difference is 2 lac only but @abdulmajidqureshi is 100% right GLX is way better value.
The LED with drl vs non-LED headlights, cruise control vs not, digital ac vs analog, fog lights vs not, reverse camera vs not, folding side mirrors vs not, key less entry and push start vs not, parking sensors vs not, 6 airbags vs 2 (!!!)
Just look at spec sheet in brochure it's never ending, and these differences add up
Just the differences in steering wheel alone make the GLX seem like it's a higher tier car, go see for yourself in person.
Its a 7% difference in price for way more than 7% in goodies. Personally telescopic steering, height adjust seat, cruise control and reverse cameras were the deal makers for me, werna I would have gotten yaris or City, but yaris has no cruise or height adjust and City with height adjust and cruise control and reverse camera was 35 lacs plus and missing many GLX swift safety features like esp/traction control and hill assist and 4 airbags.
As long as suzuki will uphold the booking price and Not pass on price increase after full payment its a no-brainer. Go for GLX in my opinion so you don't feel later that you missed out.
